[from wart by analogy with
misbug] A feature that superficially appears to be a
wart but has been determined to be the Right Thing. For
example, in some versions of the EMACS text editor, the
`transpose characters' command exchanges the character under the
cursor with the one before it on the screen, except when the
cursor is at the end of a line, in which case the two characters
before the cursor are exchanged. While this behavior is perhaps
surprising, and certainly inconsistent, it has been found through
extensive experimentation to be what most users want. This feature
is a miswart.